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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acd6570bb594392ac4f2e251e905bd35c10b83b8143220fd91187f8cf53d206' 
  AND token = 'zbrzANLzwoQOyJ3kkQ8/bVrDY/Uwk/dXVeOR4EU3W1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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