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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf2a18c70a33789e4cdd0a830ef03af6acfb5b4cd19931d9a7365bcb399b871' 
  AND token = '8QOhRodfPq+NSSocGvjEysnjIEQR2enT6r4OjAx0X/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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