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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46c4d9479a53ac340669d22221bcf6f78511fa5f339e2158789f0c5cecda597' 
  AND token = '9oYHx79L7jN6u4iZEEXE3S5WgRnLKBILpxh3Nui9aSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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