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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6360e81e19f9c74992419625c6cd67dda5b8b35cfa3f69e9f112568c764db42' 
  AND token = '9XfrjAfBSHf1/br6VfET/3IbdxpX4LLFftoMmAomAgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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