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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0956ef2a0eae972ed6bca86259bb827ac3c63b32d7278640dec68768e7f0e9' 
  AND token = '1GS52+3Z02o2jywfIoLNhqCdGis6bLYA9XkTrwwQe7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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