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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77be9c243aa54cad5358d59982d13fab93890825a78265ef2d504cc41d7c07d0' 
  AND token = 'POzdaPec59xBNH76ouwNVpfE3TKs3uyA6IxLmLXtGwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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