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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb447f8b6a1905a32351302f7301c2ba060f87bcd2376642e7ef8e7f1bd9d4e' 
  AND token = '9K7i6cPe3dPGCGWSS9vUDXN/QVdpF2BH6OIj0NTLM40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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