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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9e24019a19873904c6f9c83933685f8322fb5c7d3fbd7cea93ba8cc6a0a893' 
  AND token = '7X89f8LzeWik5K9vtWxG0t7MOqYhm90NAP/T3K4Zdms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}