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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978b29957b0b203cf115ff77806f398c59e3bc3dbb88f287fd5e43d0400bd3df' 
  AND token = 'W4NSHS9Ahpll1xQ4cOgrP9wlVfhXLPbGjN6sxYFS3QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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