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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9eb6a087258c06ed6a9d1052d4541e0ef597e499ebed19cdf397a3711677ce' 
  AND token = '/TUfaX4HM0kBQLJhSUTfct83BTU/t4/Dhn1xOzIsZpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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