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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479a04e265c7e3c792b7578b5cf25a530828ac52cba1c6024ef3ec5eecea6da5' 
  AND token = 'rKdiF2j5SPPvEQr4q77hqdffEGms6ldqpeyGD4esIZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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