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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88c054dd24cb43ca4ec23849cf8513876b9a5c6bec5ac031bf3ee694e995f92' 
  AND token = 'BfoOM8Z7ouQHC261qDqftXtZGSJdB8+ZkPqpKLOKu4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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