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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2824c9fd9fbe07a08bdb24ad3ecfed3dc1a642b330c3a1aac8db3d9cda8623' 
  AND token = '07Vp2spnDBzeviXs+CB5WzZZSdGx3yRTG97v4sEuGDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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