SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa59354c726409cdc70d81059ff2cc5eb820966a04bfc6bd475f3205c22e3c1' 
  AND token = 'U562TIvLi/gZTLw2+2vKGOwbT1s7XPF/rmhVvU25lEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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