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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dddf24aa917d358251cd4a81f390bd6b9f8a9e614627041f0478db10ccf92d8' 
  AND token = '5y9o2NUUgyEPo1yqtDqzr5w3HTmJKsOq5dUGg/DALd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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