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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d6f4be45775c65b34c01e016dcab4a0f842be084e81ec85cdd3f1ee5659c3a' 
  AND token = '8gRghDH0IMktW+Y/KZHD8LrCD88kVEii92/aIKMJfNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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