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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08fd2a7d4a3bd86ac7c621e326ee537633b8dc46e5df93aa15711473b1b591c' 
  AND token = 'jb1gjWgfKrky9J7vQfr4qXAOIWq+lWON6vcnzURU8io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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