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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785b3889536785099ab939d3c9386149df1d93c06f95e6db64ecbd845c905dfc' 
  AND token = 'R81Ks95QCSIM4b/OZDVsJvHQuDIh+H0PaUd7WtKQKXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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