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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907d84bbdcb126403fc72e2077f39868bd2fda296ad5f4c705c4b6b4fc13a9f0' 
  AND token = 'YfUV7xiKcc1EaRJsQ1kz3ZSYoJl38edyBKgBzSkhlCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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