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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439a5468ba4efc458219c8fa301505486d01dcfb31927fc155c7cc1109ca0c07' 
  AND token = 'IYmC+Ky2f1sjNEnJQySTaa/HhdU17togA+w4qlvFpjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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