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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c97e70243899a424c92ff7d101aabffa5aa8ebdc579f8466a8a5a2a7cc792d6' 
  AND token = '4hdG01SsA2JZxNZVSlTjk7wSIHW5PYth7XusDqhTL2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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