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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee702a47be06119b0002393baca96dfb1a6297d3cba9938a3e489496c324bda2' 
  AND token = 'h5ji7ts1mfFgxMZBCbkh/pf6rxgHZIH2Exct2xQegYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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