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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f99c1cec341a23d69f4ccd9ef2f5eeae8ff651aa41e5bf489e2baee404ae3c8' 
  AND token = 'G9g5ODyOWN1yDRAVqvD0nqwADMArUTxNhJlQmZQ9qOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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