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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfcc165987d1f047236cd7ff8547ca9375d7f1eeda10d6e0c5bd6d46d8b41d4' 
  AND token = 'SVXa5jEZbJJ6WVq1GzAukcC8yyL3ieMIjNUTvDz1Egg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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