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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e557371ae6ddea5d5d4bdca9f3f67a38cbc8adef31f03a675e506689c0ab7478' 
  AND token = 'qsomlslybynzN8JpMxIJ4YpMBQ04TQ+PVu3otdOg4SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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