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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ae818977488c013d99faba22f63d2316d515450473331b765385a9fe824b0d' 
  AND token = 'KfujR6ZDGAmlIGA4kNmaaVKfC4KnIvwAslM/Rsi7DEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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