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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a7cac9c66775bea50af65f8451716291f9b2f75a7208f2a5b0b944867c68ad' 
  AND token = '7K6mY2y76ilplGBl4UqgzLZZxlizYQwpGFoits7D1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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