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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4ccab36a220853eb785aae8bf4953b7a8b6d4f25375d58fba887fddb591e9b' 
  AND token = '6mxMc0XeEyj3vl5mAG7XsLIvvBEucr89dHjb0kSHG/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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