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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ca555bc9d2d565bd35c201dbd4308b8bd69044102600fbe4f8a241b3286c62' 
  AND token = 'hPDEd3d4noif6Rd/7zvZy7a36Rpqj0SRtVpQvDK+9N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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