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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d832ab7952b99c3193b7abfe2262c92246a5ab576573b33721ae8e5d05c743' 
  AND token = 'tRrVHW8ng8knc8vYU/1HGsRX04gsdFPEafA9PA832C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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