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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693b21854d28c34bd801bb361ca2088d1a04c0585ce44aeedcaeb8d95ae18ce8' 
  AND token = 'iMAA5NzmporQW+VSgl8zASkv/WiqYhnILxrNLufFOfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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