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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f01828e428059dd5ec8cf53ffafccb6af943c6bc92463040527c80c0504d69' 
  AND token = 'l9Q4gBiM5LinTWBDpll40uKePqw5S9TSuxwdntQGBxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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