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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c315b0f6285848dca0557e4671a0ff920346b897751f8ef641b923a82f393e3' 
  AND token = '1DL4wU3jROxZfo6NE10XHbYkuoJom2pWZ5T5KpPK1Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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