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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2e889795fa25023c3fb078599027100a38fc642c8eb86ef142d918acecec96' 
  AND token = 'mRI8DLAtUjEQd46Jvj3qqk0C5A17/2SrDARXFmsRhKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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