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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36260750b77ce7b007956753bdd1c3122e019cce9bbfcd295b0b6506e924f343' 
  AND token = 'pe5Wjc6c5TorV8lBMc7lppvjBx8V0u8YN8DxZVKiIVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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