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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669ca3c0539aa3529d0465bd7792d83fc57de44034bfd19bff1c909b0e4e3f90' 
  AND token = 'v5JHLaXSkc4PABxSEz5xbFfU1Cov3QJL3vUXGKcPXWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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