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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0723054b95254ae0989449e868af2ee16af4a10884df9e92c9efa49a415ddc' 
  AND token = 'zdYSZP+bL0JbrSuhdn5wZluD/ds3eFjhTtEGh1c8+zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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