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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3342d541150fbd8a6cfdce1cac7055672a8186d4894a9ec452f7bf13bb84a9f8' 
  AND token = 'B5i8oLvVBVcF0HWmDrUc6NURUw7XBdoC2CdN+qb2TZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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