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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e343194b1ce15f2e959f13d437185249434c41b4739ec3aa55d2f6da3f526b' 
  AND token = 'ytB8dnZvlI/F5fu5rxfznpv62V+WV0s0y2+N1EIRfOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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