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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b504d90c42adaa5f62f62a8edf5767c0c101271987356cc11d851b57f5c4fabd' 
  AND token = 'XDL0D9PH+zBxoceUxZTGBuQb5erf09/GbJSbKNb/NZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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