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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8de483486f67f9b2d44ed00efdf1d4104cf7f2dff9c47aaebd90031c4bc047' 
  AND token = 'fDanOjMLIk1rH4AHYX9lo6wYdafgn4iBkxpu5D29/zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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