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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960a1531601299170e63856a278ccb427583e4914aa308d2083b8468bc8a416e' 
  AND token = 'HS7EHrwWQGDyYCX9ugUGxI8EZMrj2Ey6JZM4Ku6odl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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