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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199e72aba2f3cd8ac5ff1df862772a657d3aa326ecc3b13331b61526ac7b5e9f' 
  AND token = 'IrpNNKqu5O+9MuVU7kvrdtpmv+33xvIHJrn8Du84E3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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