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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74d12e3a8ce6ae8b0c7eb9f6eeff4f63817ed51c22a053062d3a731637b4b8f' 
  AND token = 'i2d5n26tvMQljlRI18VWNLFyrQ5EoWusToONCcwhtSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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