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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc015c236d6e82c770a9091b239ba93773fa5b6c86b98ee804e5cba0b3545b10' 
  AND token = 'LnMQf3MXfU6AmKV4ksjHxpkfjlNsZJaF8bVNMgubaj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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