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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc033a5e02d438867d962205dab3db53699f4c4b901c4204680e2b57d52d4f1' 
  AND token = 'rEgNvb4d9RTjIjo5lOEBhhuDl3EUhfz3Nfn1LL/GYlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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