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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b297db3d2383aeef6443a997d253a905284cfc3432c4a83cf31264df87327c5d' 
  AND token = 'XpQXj3SJ2robP59H+afbWdl/OhI8nC1Mt4xYsjmiunk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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