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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13466ba63255bbbe26bd93e3e530bf796efa7b245eabfc6c70eda99c3813cd8' 
  AND token = 'TvGRrqXoajfYsvxacPwTC9ZHgOCI48Jp8eYjxrthLo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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