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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae11afee88aefb42f7903134341703237ca88e4fc48105c4c4f9c86bd5786a4' 
  AND token = 'AqIjWUHzNSOK4YCKVtDrtT3yEAvqbyLUxGdbYox4+c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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