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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6073f90ebf3542bea6dc2985974e31f35787eacbda03ed6dfe809f0fd414c9ce' 
  AND token = 'RxYNmAgVvvbN7eovSqa9LxMM0gCtNC/DLNpEieQ8WT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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