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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301c4ada26e19fe4e253e060139fe7fdffcd463f838dc472939cd8745a71d3b8' 
  AND token = 'CSpZ9r3sZv/JSxh5vkTLreOHbX+ui6UH5qT6ouqu7uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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