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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2218cb51b1c9f3c250af77542db4a7c50f9bf468eccb877794b54f6c7c815f' 
  AND token = 'zrcK2P1/4RwXKbzn4zhMXxfiT0hZeK9VDE4IluycCvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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