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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282f52d8f2cefc43ab4b1a2608fd96965b5e1fcf830590d68fc66862a7e59bae' 
  AND token = 'A0R39GMmnV/Z/pE1f+/5SsCp819uaJzCxhSSDmezYRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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