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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b4b300b102b765a552a7e2e539e4a4450788e5118ba6a2f48c06e5e6629ae3' 
  AND token = 'x6u3t5d1aOuOR9bKaokUaiB8ok25dvXacsn1e+ObugI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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