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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2967e02ca579b3254464e7c15328fbdb538ee30e2f03b7d0f68967edb1b8d7' 
  AND token = 'hS6Ag4V3w4M+FS3Nu120tkEH1+HFbnNInYoUwvi/QpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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