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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac044d0cba7a399758d11d4dbe4491f5e15370f6b00007b53148bcf4d9ac60e' 
  AND token = 'b9Ocea254NvMcyHGuQ66sxRsVLFSk9bCOHmCrhsjECg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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